:root {
        color-scheme: light;
        --ink: #102033;
        --muted: #52677f;
        --line: rgba(16, 32, 51, 0.12);
        --panel: rgba(255, 255, 255, 0.9);
        --accent: #102033;
        --warn: #9b2c2c;
      }

      * {
        box-sizing: border-box;
      }

      body {
        margin: 0;
        min-height: 100vh;
        display: grid;
        place-items: center;
        padding: 24px;
        font-family: "Avenir Next", "Segoe UI", sans-serif;
        color: var(--ink);
        background:
          radial-gradient(circle at top right, rgba(16, 32, 51, 0.16), transparent 28%),
          linear-gradient(180deg, #eef3f8, #f8fbff 42%, #eef4fb);
      }

      button {
        font: inherit;
        cursor: pointer;
      }

      main {
        width: min(960px, 100%);
      }

      .panel {
        padding: 36px;
        border-radius: 8px;
        background: var(--panel);
        border: 1px solid var(--line);
        box-shadow: 0 24px 80px rgba(16, 32, 51, 0.09);
      }

      .eyebrow {
        margin: 0;
        font-size: 0.72rem;
        letter-spacing: 0.12em;
        text-transform: uppercase;
        color: var(--muted);
        font-weight: 800;
      }

      h1 {
        margin: 0;
        font-size: clamp(2rem, 4vw, 3rem);
        line-height: 1.1;
      }

      p {
        color: var(--muted);
        line-height: 1.6;
        margin: 0;
      }

      nav,
      .actions {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        margin-top: 24px;
      }

      a,
      button,
      .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 0;
        border-radius: 999px;
        padding: 12px 18px;
        background: var(--accent);
        color: #f8fbff;
        text-decoration: none;
        font-weight: 800;
      }

      button:disabled {
        cursor: not-allowed;
        background: #d8e0e8;
        color: #7a8ba0;
      }

      button.secondary {
        background: #e3e9f0;
        color: var(--ink);
      }

      .status {
        min-height: 220px;
        display: grid;
        align-content: center;
        gap: 14px;
      }

      .error {
        color: var(--warn);
      }

      .signed-in {
        margin-top: 18px;
      }